[iOS] public the dictionary of recordStatsMap and recordStageMap (#2882)

Author: jianhan-he

ios/sdk/WeexSDK/Sources/Performance/WXApmForInstance.h

@@ -125,6 +125,8 @@ extern NSString* const VALUE_ERROR_CODE_DEFAULT;
 @property (nonatomic, assign) BOOL isDownLoadFailed;
 @property (nonatomic, assign) BOOL forceStopRecordInteractionTime;
 @property (nonatomic,assign) double pageRatio;
+@property (nonatomic,strong) NSMutableDictionary<NSString*,NSNumber*>* recordStatsMap;
+@property (nonatomic,strong) NSMutableDictionary<NSString*,NSNumber*>* recordStageMap;
 
 #pragma mark - basic method
 

ios/sdk/WeexSDK/Sources/Performance/WXApmForInstance.m

@@ -134,8 +134,6 @@ @interface WXApmForInstance ()
 
 @property (nonatomic,strong) id<WXApmProtocol> apmProtocolInstance;
 @property (nonatomic,strong) NSString* instanceId;
-@property (nonatomic,strong) NSMutableDictionary<NSString*,NSNumber*>* recordStatsMap;
-@property (nonatomic,strong) NSMutableDictionary<NSString*,NSNumber*>* recordStageMap;
 @property (nonatomic,strong) NSMutableArray<NSNumber*>* recordUpdateComponentDataTimestamp;
 @property (nonatomic,strong) NSMutableArray<NSNumber*>* recordUpdateComponentDataTime;